Annual report pursuant to Section 13 and 15(d)

Equity Investments - Investments Accounted for by the Equity Method (Details)

v3.20.4
Equity Investments - Investments Accounted for by the Equity Method (Details) - USD ($)
 12 Months Ended
May 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]        
Carrying Value   $ 24,816,000 $ 32,044,000  
Loss (income) from equity investments, net   $ 11,055,000 210,148,000 $ (49,904,000)
Investment in Grizzly Oil Sands ULC        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership %   24.50%    
Carrying Value   $ 24,816,000 21,000,000  
Loss (income) from equity investments, net   $ 377,000 32,710,000 $ 510,000
Investment in Mammoth Energy Services, Inc.        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership %   21.50%   21.50%
Carrying Value   $ 0 11,005,000  
Loss (income) from equity investments, net   $ 10,646,000 179,524,000 $ (49,969,000)
Investment in Tatex Thailand II, LLC        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership %   23.50%    
Carrying Value   $ 0 0  
Loss (income) from equity investments, net   $ 0 (2,086,000) (241,000)
Other Equity Investments        
Schedule of Equity Method Investments [Line Items]        
Approximate Ownership %   0.00%    
Carrying Value   $ 0 39,000  
Loss (income) from equity investments, net   $ 32,000 $ 0 $ (204,000)
Investment in Strike Force Midstream LLC        
Schedule of Equity Method Investments [Line Items]        
Loss (income) from equity investments, net $ (96,400,000)